/*
 *  Copyright (c) 2018, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
 *
 *  WSO2 Inc. licenses this file to you under the Apache License,
 *  Version 2.0 (the "License"); you may not use this file except
 *  in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing,
 *  software distributed under the License is distributed on an
 *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 *  KIND, either express or implied.  See the License for the
 *  specific language governing permissions and limitations
 *  under the License.
 */
package org.wso2.carbon.apimgt.hybrid.gateway.status.checker.internal;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.osgi.service.component.ComponentContext;
import org.wso2.carbon.apimgt.impl.APIManagerConfigurationService;
import org.wso2.carbon.core.ServerStartupHandler;
import org.osgi.service.component.annotations.Activate;
import org.osgi.service.component.annotations.Component;
import org.osgi.service.component.annotations.Deactivate;
import org.osgi.service.component.annotations.Reference;
import org.osgi.service.component.annotations.ReferenceCardinality;
import org.osgi.service.component.annotations.ReferencePolicy;

@Component(
         name = "org.wso2.carbon.apimgt.micro.gateway.status.checker", 
         immediate = true)
public class StatusCheckerComponent {

    private static final Log log = LogFactory.getLog(StatusCheckerComponent.class);

    /**
     * Method to activate bundle.
     *
     * @param context OSGi component context.
     */
    @Activate
    protected void activate(ComponentContext context) {
        try {
            // Register the server start up handler which hold the execution of its invoke method until the server starts
            context.getBundleContext().registerService(ServerStartupHandler.class.getName(), new StatusCheckerServerStartListener(), null);
            if (log.isDebugEnabled()) {
                log.debug("StatusCheckerComponent bundle activated successfully.");
            }
        } catch (Throwable e) {
            log.error("Error while creating StatusCheckerComponent bundle.", e);
        }
    }

    /**
     * Method to deactivate bundle.
     *
     * @param context OSGi component context.
     */
    @Deactivate
    protected void deactivate(ComponentContext context) {
        if (log.isDebugEnabled()) {
            log.debug("StatusCheckerComponent bundle is deactivated.");
        }
    }

    /**
     * Set APIManager Configuration service to the bundle's {@link ServiceReferenceHolder}
     *
     * @param service APIManager Configuration service
     */
    @Reference(
             name = "api.manager.config.service", 
             service = org.wso2.carbon.apimgt.impl.APIManagerConfigurationService.class, 
             cardinality = ReferenceCardinality.MANDATORY, 
             policy = ReferencePolicy.DYNAMIC, 
             unbind = "unsetAPIManagerConfigurationService")
    protected void setAPIManagerConfigurationService(APIManagerConfigurationService service) {
        log.debug("API manager configuration service bound to the On-Prem Gw Status Checker");
        ServiceReferenceHolder.getInstance().setAPIManagerConfigurationService(service);
    }

    /**
     * Unset APIManager Configuration service in the bundle's {@link ServiceReferenceHolder}
     *
     * @param service APIManager Configuration service
     */
    protected void unsetAPIManagerConfigurationService(APIManagerConfigurationService service) {
        log.debug("API manager configuration service unbound from the On-Prem Gw Status Checker");
        ServiceReferenceHolder.getInstance().setAPIManagerConfigurationService(null);
    }
}

